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Use a spudger to pry the fan connector straight up and out of its socket on the logic board.

It is useful to twist the spudger axially from beneath the fan cable wires to release the connector.

The fan socket and the fan connector can be seen in the second and third pictures. Be careful not to break the plastic fan socket off the logic board as you use your spudger to lift the fan connector straight up and out of its socket. The layout of the logic board shown in the second picture may look slightly different than your machine but the fan socket is the same.

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Lift the side of the logic board opposite the ports out of the upper case.

Rotate the logic board away from the upper case until the ports clear the lip molded in the upper case.

Pull the logic board and MagSafe board away from the edge of the upper case as one piece.

The MagSafe board may get accidentally disconnected during this process. As a precaution, be sure the MagSafe board connector is securely seated in its socket before lowering the logic board back into the upper case.

Before lowering the logic board back into the upper case, be sure the left speaker and microphone cables are seated in their channels cut into the upper case (as seen in the third picture).

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Starting in Step 10 there are very delicate connectors that are easily broken. I first attempted to lift one with a spudger and noticed it begin to crack. I found an alternative way that worked perfectly for all of these types of connectors. Using 2 straight pins, press the point of each one just on either side of the connector, between the connector and the housing. Then use each pin to evenly pry the connector up. It will pop right out of the socket with no damage.

My macbook has been gradually getting hotter and running slower. Recently it started displaying some weird behavior that I assumed was a failing HD since it's 5 years old. I ran the extended Apple Hardware Test (more than once for confirmation) and got the following error: 4SNS/1/40000000: TN1D-104.000. Googling suggested that the CPU's northbridge was reaching a temperature of 104 deg. C and that macbooks have issues with overheating that can be attributed to poor application of thermal paste.

I followed this guide. The fan, heatsink fins and the underside of the logic board were almost completely clogged with dirt and cat hair. Got rid of it that, cleaned the excessive globs of dried up thermal paste, reapplied thermal paste and put everything back together. The macbook is now running cooler and faster and video is running quite smoothly which was an issue previously. I reran the Apple Hardware Test which reported, "No trouble found".